Refactor phoenix

[seofernando25]

Refactors the phoenix to use a centralized Board abstraction for peripheral setup and moves tasks to a more modular setup.

// eg from before with peripheral access in main()
let usart = Uart::new(p.UART4, p.PA1, p.PA0, Irqs, p.DMA1_CH1, p.DMA1_CH0, uart_config);

// after
let (tx, ring_rx) = board.setup_sbg_uart();

• Also reduced main.rs from 1000 lines to 350.
• Getting a small issue with SBG DMA (Could be wrong cable setup)
• Added runtime feature flags (could change it to feature flags in the future)